Thank you! I usually read the manual before asking, but this seemed sufficiently complicated enough not to be in the manual. I was expecting some kind of iptables solutions, but this is better, obviously!
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SovieroOct 31 '11 at 4:51

1

I would be kind of wary of putting PermitRootLogin without-password into my sshd configuration!
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Michael KjörlingOct 31 '11 at 10:10